ok folks here is how its done.
this work best on new characters who have not unlocked elite skills.
buy as many eliete tomes as you want elite skills on you bar at once.
make sure you have you bar empty and use a tome to choose your first eliete skill
then open another space on your bar and choose another skill.
the elite skill will add to your bar without removin the first one.
contiune for as many eliete skill you want at once.

Faulx

after you go in a zone and come back wouldnt all the skills go out of your bar?

Yes